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Water is made up of molecules, each wIth two atoms 01 hydrogen and one atom 01 oxygen. In its natural state, it IS a liquid, Like other liquids, when Irozen, it becomes a solid and when heated, it turns into a gas. Water is constantlv moving and changing in nature, and it does so in a predictable way. This pattern is called the Water Cycle. ~@ .~@W ~@1@ ,..c v. r CLOUD RAIN LAKE ~TATE GLASS TO 'WET HIE"511XS Heat some water until it is near the boiling point. Place it in a drinking glass and rotate the glass so as to moisten the sides clear to the top. Place some very cold water In a round Ilask and set it on the top of the glass as Shown. WHAT HAPPENED? Wilt.,.frrJmthtl".".~por' tlrn .nd cond_.. rJn rhtl UnM'lid. of tn. round ".lk./t tllM "r.m,", Of prr!Clplt6~J back into tn. pili!. Place each 01 the follOWing words in the appropriate space to illustrate water as found in nature: lake, cloud, rain. Look up the words: evaporation, condensation and precipitation, and be able to identify each process in the experiment. Prepare some "ocean" water by mixing 5 drops of food RON OCEAN' n EAllTH coloring (representing salt) and 1 Cup of water, Heat the ocean water as shown, Where did the"salt "go? The "salt" remains in the "ocean", Of in this case, remains in the flask which was heated. Why? The lighter molecules of water evaporate, leaving the heavier sal!, If all of the water was boiled away, a salt residue would remain. ~ lJJ1lWfl} lC.e~ II '/;~4~1 600 I, 6 4 I I 1/ ,I r ~ -:'I<f~~.\. " " -12- DlSTlLlfD WAl"Ej:t Mount a metal cookie sheet 35-40 cm above a /Iat of small plants. Arrange cracked ice Chips all over the sheet. Place a lea kellle so that the risIng steam comes in contact with the under side of the cookie sheet and WATCH IT RAIN. Why doesn't the sleam fall on the seedlings ralher than rise to the cookie sheet? Since warm air rises, the water vapor mllst cool by coming in contact with the Chilled ice pan before the vapor condenses and falls as rain.